*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
198814
19894
19900
19912
19921
199316
19940
199525
19960
19970
19980
19990
20000
20010
20021
20030
20040
20051
20060
20070
20080
20090
20100
20111
20121
20132
20141
20150
20160
20170
20181
20191
20200
20210
20220
20230
20240
Total72