*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19851
19860
19871
19880
19890
19903
199143
19925
19935
19949
19952
19968
19976
19981
19990
20007
20010
20027
200314
20040
20051
20062
20072
20085
20092
20101
20112
20120
20130
20141
20151
20163
20170
20187
Total140