*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19722
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19873
19884
19891
19907
19912
19926
199315
19940
19955
19961
19970
19980
19993
20003
20013
20028
20036
20041
20050
20069
20070
20080
20092
20106
20116
20123
20131
20141
20150
20164
20170
20182
20190
20200
Total105