*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19912
19920
199310
19940
19950
19961
19970
19980
19994
20000
20010
20021
20030
20040
20050
20060
20070
20085
20090
20100
20110
20121
20130
20142
20150
20161
20170
20180
20190
20200
Total29