*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
19871
19881
19891
19902
19914
19928
199317
19944
19952
19961
19973
19982
19990
20004
20010
20020
20030
20041
20050
20060
20070
20080
20094
20106
20110
20120
20130
20141
20150
20160
20171
20180
20196
20201
20214
20228
20234
20241
Total87