*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19894
19906
19910
19920
19930
19940
19951
19962
19970
19980
19992
20000
20018
20022
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20152
20161
20170
20180
20191
20200
20210
20220
Total36