\begin{table}%t3
%\centering
\par
\caption{\label{tab3}Estimated values of $r$, $a$, $b$, $c$ for $E(n(t))= (r(a
+ \cos (bt+c))/\lambda$.}
\begin{tabular}{lllllll}
\hline
\hline\noalign{\smallskip} Cycle & $r$ & $a$ & $b$ & $c$ & $\alpha$ & $\gamma$\\
\hline\noalign{\smallskip}
1943--1953 & 5.00 &  1.132 & 0.00183 & 4.03 & 0.0557 & 0.2227 \\
1954--1964 & 6.30 &  1.062 & 0.00195 & 4.14 & 0.1082 & 0.4329 \\
1965--1975 & 3.80 &  1.035 & 0.00135 & 4.72 & 0.1087 & 0.4347 \\
\hline
\end{tabular}
\end{table}