*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19860
19870
19889
198914
199017
19917
19923
19933
19940
19953
19960
19975
19982
19998
20001
20016
20020
20031
20040
20050
20060
20070
20083
20090
20103
20119
20121
20130
20140
20153
20161
20173
20180
Total105