*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19861
19872
19884
19893
19900
19916
19921
19930
19940
19954
19960
19970
19980
19990
20000
20011
20020
20030
20041
20050
20060
20070
20086
20090
20104
20112
20121
20134
20144
20150
20160
20171
20180
Total46