*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19821
19830
19840
19852
19864
19870
19884
19890
19901
199123
19924
199332
19944
19951
19960
19971
19980
19998
20006
20012
20020
20031
20040
20052
20060
20070
20084
20092
20107
20118
20120
20130
20142
20150
20167
201714
20189
20192
20200
20210
20220
Total153