*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
19871
19880
19890
19900
19913
19920
19930
19944
19951
199611
19973
19980
19990
20000
20011
20020
20030
20040
20050
20060
20070
20084
200919
201012
201112
20125
201310
20145
201510
20166
20170
20180
20190
20200
20210
20221
20230
20240
Total108