*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19761
19770
19780
19792
19800
19812
19820
19831
19840
19850
19860
19870
19880
19890
19900
19911
19920
19932
19943
19951
19960
19974
19980
19990
20001
20017
20020
20030
20040
20051
20060
20071
20081
20090
20100
20110
20120
20130
20140
20155
20160
20179
20180
20190
20205
20215
20220
20235
20241
Total59