*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19844
19855
19860
19870
19880
19890
19902
199121
19924
199327
199413
199546
19960
19972
19980
19990
20000
20010
20020
20030
20045
20050
20068
20075
200816
20091
20101
20113
20121
20132
20142
20150
20161
20170
20182
20190
20201
20210
20220
20237
20246
Total186