*Excludes Observations that spanned multiple years

Pre 19700
19700
19714
19723
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
198417
19850
19864
198726
198826
19890
19901
199127
19927
199322
19940
199557
199627
199732
199822
199940
200051
200125
200216
20030
20043
20050
20061
20070
20082
20090
20100
20110
20120
20130
20140
20150
20161
20170
20180
20190
20200
Total414