*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19870
19880
19891
19902
19913
19923
19935
19940
199521
19960
19972
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20141
20150
20160
20171
20180
20191
20200
20210
20220
20233
Total45