*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
19882
19890
19900
199138
19923
19930
19940
19953
19960
19970
19980
19990
20000
20010
20020
20030
20040
20055
20060
20070
20084
20090
20100
20110
20120
20130
20141
20150
20160
20170
20181
20190
20200
20210
20220
Total57