*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
19871
19880
19890
19900
19911
199210
19935
19940
19950
19961
19970
19980
19990
20000
20010
20020
20030
20041
20050
20064
20070
20081
20090
20101
201114
20120
20130
20141
20150
20160
20170
20180
20190
20203
20214
20221
20236
20249
Total63