*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19843
19850
19860
19871
19881
19890
19900
19911
19920
19931
19940
19952
19960
19970
19980
19990
20002
20010
20026
20030
20041
20050
20060
20070
20082
20092
20100
20110
20121
20130
20140
20151
20161
20170
20180
20190
20200
20210
20220
20230
20240
Total25