*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197225
197316
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19876
198819
19893
19900
19910
19920
19933
19941
19952
199610
19970
19983
19993
20004
20010
20020
20031
20042
20050
20060
20070
20080
20091
20100
20110
20120
20130
20140
20151
20160
20170
20180
Total102