*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19911
19921
19931
19940
19950
19962
19970
19980
19990
20001
20010
20020
20031
20040
20050
20060
20070
20080
20090
20101
20110
20120
201319
20140
20150
20160
20170
20181
20190
20200
20210
20220
20230
20240
Total31