*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
198811
19891
19900
19912
19925
19933
19940
19952
19960
19970
19981
19990
20000
20010
20020
20030
20041
20050
20061
20071
20080
20090
20100
20110
20120
20131
20140
20151
20160
20170
20180
20199
20200
20212
20225
20230
20240
Total47