*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19761
19770
19780
19793
19800
19813
19820
19830
19842
19851
19860
19871
19880
19891
19901
19912
19920
19934
19940
19950
19961
19970
19980
19991
20002
20010
20020
20033
20040
20050
20061
20070
20082
20090
201031
201153
20120
20131
20140
20153
20162
20174
20183
201914
20201
20211
20228
202328
20240
Total180