*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19913
19920
19930
19942
19952
19968
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20081
20090
201014
20115
20124
20139
201416
201511
20163
20170
20180
20190
20201
20210
20220
20230
20240
Total79