Add content in a global table located in the beginning of the document

Question

I would like to generate a global table with entries that can be added with a command. I based myself on this post. The issue I have is that I can only display the table after I added all its entries. I wold like to be able to insert the completed table before calling all entries.

What I did so far:

% beginning of global table
\newcommand\startGlobalTable{
    \def\GlobalTable{%
    \begin{longtable}{ ll }
        \hline
        Name & Year \\
        \hline
}}

% appending element to global table
\newcommand\addGlobalTable[2]{
    \edef\GlobalTable{\expandafter\unexpanded\expandafter{%
        \GlobalTable%
            {#1} & {#2} \\
        \hline
    }}
}

% display the global table
\newcommand\createGlobalTable{\begin{center}\GlobalTable\end{table}\end{center}}

Whit this setup, the global table is displayed at the end of my document:

\startGlobalTable
Some text some text
\addGlobalTable{Hello}{World}
Some different text
\addGlobalTable{Hello}{Moon}
Some final text
\createGlobalTable

However when writing something like this the table at the beginning is (obviously) empty:

\startGlobalTable
\createGlobalTable
Some text some text
\addGlobalTable{Hello}{World}
Some different text
\addGlobalTable{Hello}{Moon}
Some final text

How can I display the table in the beginning of the document containing all entries that will be added later?

Many thanks in advance for your answers!