*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19724
19735
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19864
19877
19888
19893
19907
199121
19926
19930
19940
19950
19960
19970
19984
19991
20002
20010
20020
20030
20040
20050
20061
20070
20081
20092
20100
20110
20120
20130
20140
20150
20166
20171
20180
Total85