*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19831
19840
19850
19860
19879
19885
19892
19900
19910
199211
19932
19944
19959
19965
199715
19987
199910
200017
20011
20021
200310
20042
20051
20063
20072
20082
20090
20104
20111
20120
20130
20141
20150
20161
20170
Total129