*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19930
19940
19950
19961
19970
19981
19990
20000
20010
20020
20031
20040
20050
20061
20070
20085
20090
20101
20111
20120
20132
20140
20150
20160
20170
20180
20193
20200
20211
20221
20230
20240
Total22