*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
199135
19924
199319
19942
19955
199614
19974
19981
199919
20007
20016
20023
20031
20040
20050
20060
20071
20080
20091
20101
20110
20121
20132
20140
20153
20160
20170
20181
20190
20200
20210
Total131