*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19920
19931
19940
19950
19960
19970
19980
19990
20000
20011
20020
20031
20041
20050
20061
20070
20080
20090
20101
20110
20120
20130
20140
20150
20160
20172
20180
20191
20203
20211
20220
20230
20240
Total15