Hallo liebes Forum,

nun hab eich ein kleines Problem mit einer Tabelle:

Code:
\documentclass[%
	fontsize=11pt,
	paper=a4,
	BCOR5mm,						
	DIVcalc,						
	DIV=13,							
	headinclude,				
	footinclude=false,		
	pagesize,
]{scrreprt}

\usepackage{array}
\usepackage{booktabs}
\usepackage{dcolumn}
\usepackage{tabularx}

\usepackage[locale=DE]{siunitx}

\makeatletter
\newcolumntype{d}[1]{>{\DC@{.}{,}{#1}}c<{\DC@end}}
\makeatother

\begin{document}

\begin{table}[!htb]
\caption{Blablablablablabalbalablabalablabalbalbal}
	\centering
	\begin{tabularx}{\textwidth}{X @{\extracolsep\fill} c d{2.1} d{5.2} d{2.1} d{5.2} d{1.1} d{4.2}} \toprule
	\textbf{Affe} & & \multicolumn{2}{c}{\textb{Bananenverkauf2008}} & \multicolumn{2}{c}{\textbf{Kiwiverkauf 2013}} & 	\multicolumn{2}{c}{\textbf{Differenz}} \\ \midrule
 	& $U_n$ & \multicolumn{1}{c}{$I_{k3}$} & \multicolumn{1}{c\{$S_k$} & \multicolumn{1}{c}{$I_{k3}$} & \multicolumn{1}{c}{$I_k$} & \multicolumn{1}{c}{$I_{k3}$} & \multicolumn{1}{c}{$I_k$} \\ \midrule
 	& \si{\kilo\volt} & \multicolumn{1}{c}{\si{\kilo\ampere}} & \multicolumn{1}{c}{\si{\kilo\ampere}} & \multicolumn{1}{c}{\si{\kilo\ampere}} & \multicolumn{1}{c}{\si{\kilo\ampere}} & \multicolumn{1}{c}{\si{\kilo\ampere}} & \multicolumn{1}{c}{\si{\kilo\ampere}} \\ \midrule
	Gorilla & xxx & 12.3 & 12345.67 & 12.3 & 12345.67 & 1.2 & 1234.56 \\ \midrule
	Zwerrgorilla & xxx & 12.3 & 12345.67 & 12.3 & 12345.67 & 1.2 & 1234.56 \\ \bottomrule
	\end{tabularx} \\
	\label{tab:blabla}
\end{table}

\end{document}