*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19900
19910
19923
19930
19944
19956
19960
19970
19981
19992
20000
20012
20020
20030
20042
20050
20060
20070
20081
20090
20103
20110
20120
20130
20140
20150
20161
20172
20180
20196
20202
20217
20222
20235
20242
Total53