*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19801
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19911
199236
19932
19941
19956
19962
19970
19980
19993
20001
20010
20020
20033
20040
20050
20060
20071
20081
20091
20100
20111
20121
20132
20142
20150
20161
20179
20181
20191
20200
Total79