*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19741
19750
19760
19770
19780
19791
19800
19810
19822
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19930
19945
19951
19960
19970
19981
19995
20000
20010
20020
20030
20041
20050
20061
20070
20080
20091
20109
201125
20120
20131
20141
20150
20162
20170
20180
20193
20202
20214
20223
20234
20243
Total78