*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19922
19931
19940
199510
19960
19970
19985
19990
20000
20012
20020
20030
20040
20050
20060
20070
20080
20091
20100
20113
20121
20130
20140
20150
20160
20170
20180
20190
20200
20211
20221
20234
20240
Total31