*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19844
19851
19861
19872
19881
19891
19901
19910
19923
19930
19942
19952
199626
19972
199813
19996
20000
20014
20021
20030
20040
20051
20060
20070
20083
20091
20100
20111
20122
20130
20142
20151
20160
20170
20180
Total82