I have table A.3 that I want to convert into a layout more like table A.4 so that it fits the text width. I know this is best attained by using tabular. I actually had a solution similar to A.4 before shifting to tabulary but it was too wide at the time. In advance, many thanks for your suggestions on fitting the table to the textwidth with tabular (maybe there is a better solution with tabulary, although I doubt it).
documentclass[12pt]{report}
\usepackage{multirow}
\usepackage{bigstrut}
\usepackage{booktabs}
\usepackage{tabulary}
\makeatletter
\def\hlinewd#1{%
\noalign{\ifnum0=`}\fi\hrule \@height #1 \futurelet
\reserved@a\@xhline}
\makeatother
\begin{document}
\begin{tabulary}{\textwidth}{L|RRR|RRRR}
\hline
& \multicolumn{3}{c|}{\textbf{Associations}} & \multicolumn{4}{c}{\textbf{Gymnasts}} \bigstrut\\
\hline
\multicolumn{1}{l|}{Nation} & Total & km2 per association & Inhabitants per association & Total & per 100 km2 & Inhabitants per gymnast & per association \bigstrut\\
\hline
\multicolumn{1}{l}{Germany} & 6'915 & 94 & \multicolumn{1}{r}{8'297} & 692'765 & 105 & 83 & 100 \bigstrut[t]\\
\multicolumn{1}{l}{France} & 700 & 766 & \multicolumn{1}{r}{55'030} & 100'000 & 18 & 385 & 143 \\
\multicolumn{1}{l}{Czech countries} & 573 & 138 & \multicolumn{1}{r}{15'227} & 47'500 & 61 & 1'884 & 83 \\
\multicolumn{1}{l}{Switzerland} & 590 & 70 & \multicolumn{1}{r}{5'617} & 43'475 & 104 & 71 & 73 \\
\multicolumn{1}{l}{Belgium} & 169 & 174 & \multicolumn{1}{r}{38'970} & 14'704 & 50 & 448 & 87 \\
\multicolumn{1}{l}{Italy} & 106 & 2'704 & \multicolumn{1}{r}{297'000} & 13'175 & 5 & 2'390 & 124 \\
\multicolumn{1}{l}{Netherlands} & 154 & 214 & \multicolumn{1}{r}{34'176} & 10'208 & 31 & 515 & 66 \\
\multicolumn{1}{l}{Norway} & 61 & 5'284 & \multicolumn{1}{r}{36'357} & 6'500 & 2 & 343 & 120 \\
\multicolumn{1}{l}{Spain} & - & - & \multicolumn{1}{r}{-} & 5'027 & 1 & 3'563 & - \\
\multicolumn{1}{l}{Hungary} & 45 & 6'285 & \multicolumn{1}{r}{1'019'666} & 4'500 & 1.6 & 10'197 & 100 \\
\multicolumn{1}{l}{Denmark} & 27 & 1'412 & \multicolumn{1}{r}{81'000} & 3'500 & 19 & 625 & 130 \\
\multicolumn{1}{l}{Sweden} & 35 & 12'878 & \multicolumn{1}{r}{144'750} & 2'200 & 0.5 & 2'303 & 63 \\
\multicolumn{1}{l}{Luxembourg} & 19 & 136 & \multicolumn{1}{r}{11'526} & 1'328 & 51 & 165 & 70 \bigstrut[b]\\
\hline
\end{tabulary}%
\end{document}
EDIT:
I have edited the table reaching a width that suits me. However, the margin to the second hline is far too large when I use \bigstrut\ (cf. pciture 3). If I leave it out "Inhabitants" is too near to the hline. How can I approrpiately modify this?
documentclass[12pt]{report}
\usepackage{multirow}
\usepackage{bigstrut}
\usepackage{booktabs}
\usepackage{tabulary}
\makeatletter
\def\hlinewd#1{%
\noalign{\ifnum0=`}\fi\hrule \@height #1 \futurelet
\reserved@a\@xhline}
\makeatother
\begin{document}
\begin{tabulary}{\textwidth}{LRRRRRRR}
\hline
& \multicolumn{3}{c}{\textbf{Associations}} & \multicolumn{4}{c}{\textbf{Gymnasts}} \bigstrut\\
\hline
\bigstrut\\
\multicolumn{1}{l}{Nation} & Total & km2 per association & \shortstack{Inhabitants\\ per association} & Total & per 100 km2 & \shortstack{Inhabitants\\ per gymnast} & per association \bigstrut\\
\hline
\multicolumn{1}{l}{Germany} & 6'915 & 94 & \multicolumn{1}{r}{8'297} & 692'765 & 105 & 83 & 100 \bigstrut[t]\\
\multicolumn{1}{l}{France} & 700 & 766 & \multicolumn{1}{r}{55'030} & 100'000 & 18 & 385 & 143 \\
\multicolumn{1}{l}{Czech countries} & 573 & 138 & \multicolumn{1}{r}{15'227} & 47'500 & 61 & 1'884 & 83 \\
\multicolumn{1}{l}{Switzerland} & 590 & 70 & \multicolumn{1}{r}{5'617} & 43'475 & 104 & 71 & 73 \\
\multicolumn{1}{l}{Belgium} & 169 & 174 & \multicolumn{1}{r}{38'970} & 14'704 & 50 & 448 & 87 \\
\multicolumn{1}{l}{Italy} & 106 & 2'704 & \multicolumn{1}{r}{297'000} & 13'175 & 5 & 2'390 & 124 \\
\multicolumn{1}{l}{Netherlands} & 154 & 214 & \multicolumn{1}{r}{34'176} & 10'208 & 31 & 515 & 66 \\
\multicolumn{1}{l}{Norway} & 61 & 5'284 & \multicolumn{1}{r}{36'357} & 6'500 & 2 & 343 & 120 \\
\multicolumn{1}{l}{Spain} & - & - & \multicolumn{1}{r}{-} & 5'027 & 1 & 3'563 & - \\
\multicolumn{1}{l}{Hungary} & 45 & 6'285 & \multicolumn{1}{r}{1'019'666} & 4'500 & 1.6 & 10'197 & 100 \\
\multicolumn{1}{l}{Denmark} & 27 & 1'412 & \multicolumn{1}{r}{81'000} & 3'500 & 19 & 625 & 130 \\
\multicolumn{1}{l}{Sweden} & 35 & 12'878 & \multicolumn{1}{r}{144'750} & 2'200 & 0.5 & 2'303 & 63 \\
\multicolumn{1}{l}{Luxembourg} & 19 & 136 & \multicolumn{1}{r}{11'526} & 1'328 & 51 & 165 & 70 \bigstrut[b]\\
\hline
\end{tabulary}%
\end{document}
\\[2cm]
command no need for\bigstrut
in that context