*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19891
19901
19910
19920
19930
19943
19954
19961
19974
199819
199910
20001
20014
20025
20035
20044
20051
20063
200714
20080
20096
20100
20111
20120
20130
20140
20150
20165
20170
Total94