*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19922
19932
19940
19951
19961
19970
19980
19990
20000
20010
20020
20030
20040
20050
20062
20070
20089
20096
20100
20110
20120
20130
20140
20151
20160
20172
20181
20191
20202
20211
20222
20230
20240
Total34