*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19890
19901
19915
19921
199310
19941
199532
19962
19970
199817
19998
20002
20010
20025
20033
20042
20050
20060
20070
20080
20090
20101
20110
20120
20131
20140
20150
20161
20170
20180
20190
20200
Total94