*Excludes Observations that spanned multiple years

Pre 19700
19700
19712
19720
19731
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19911
19920
19930
19942
19950
19963
19972
19980
19990
20000
20015
20020
20030
20042
20052
20060
20070
20083
20091
20100
20110
20120
20130
20141
20150
20160
20170
Total27