*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197225
197316
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
198429
19851
198634
198750
198846
198911
199010
19916
19925
19937
19941
19952
19962
19974
19980
199930
200033
20017
200216
20032
20041
20050
20061
20070
20080
20090
20101
20110
20120
20130
20140
20150
20165
20172
20180
20190
Total348