YEAR CORRS RBAR SDEV SERR EPS CORES 1920. 105. 0.2250 0.2259 0.0220 0.8401 18.10 1930. 171. 0.1753 0.2565 0.0196 0.8092 19.95 1940. 190. 0.2286 0.2236 0.0162 0.8556 20.00 1950. 190. 0.3481 0.2180 0.0158 0.9144 20.00 1960. 190. 0.3906 0.2013 0.0146 0.9276 20.00 1970. 190. 0.4255 0.1806 0.0131 0.9368 20.00 1980. 190. 0.3480 0.2099 0.0152 0.9143 20.00