*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19840
19859
19864
19870
198840
19896
19902
19910
19929
19931
19942
19950
19960
19971
19980
19990
20000
20010
20022
20030
20042
20058
20060
20070
20081
20091
20100
20111
20120
20131
20140
20150
20160
20170
Total92