\begin{table}%t1
%\addtocounter{table}{-1} 
\caption{\label{number}Increase with time of the number of known QSOs, 
BL Lacs and Seyfert 1s.} 
\small%\centering
\par
\begin{tabular}{rrrl} 
\hline \hline 
QSO & BL Lac & Seyfert 1 & reference \\ 
\hline 
    202 &     &         & De Veny et~al. (1971)                     \\ 
 2251 &     &     190 & V\'eron-Cetty \& V\'eron (\cite{veron84}) \\ 
 2835 &  73 &     236 & V\'eron-Cetty \& V\'eron (\cite{veron85}) \\ 
 3473 &  84 &     258 & V\'eron-Cetty \& V\'eron (\cite{veron87}) \\ 
 4169 & 117 &     358 & V\'eron-Cetty \& V\'eron (\cite{veron89}) \\ 
 6225 & 162 &     575 & V\'eron-Cetty \& V\'eron (\cite{veron91}) \\ 
 7383 & 171 &     695 & V\'eron-Cetty \& V\'eron (\cite{veron93}) \\ 
 8609 & 220 &     888 & V\'eron-Cetty \& V\'eron (\cite{veron96a})\\ 
11~358 & 357 &  1111 & V\'eron-Cetty \& V\'eron (\cite{veron98}) \\ 
13~214 & 462 &  1711 & V\'eron-Cetty \& V\'eron (\cite{veron00}) \\ 
23~760 & 608 &  2765 & V\'eron-Cetty \& V\'eron (\cite{veron01}) \\ 
48~921 & 876 & 11~777 & V\'eron-Cetty \& V\'eron (\cite{veron03}) \\
85~221 &1122 &  9628  & Present edition                         \\
\hline 
\end{tabular} 
\end{table}