*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19891
19900
19914
19920
19930
19944
19954
199615
19972
19981
19990
20000
20010
20020
20030
20040
20050
20060
20070
20089
200917
201011
201110
20126
201313
20148
20158
20163
20170
20180
20190
20200
20210
20220
20230
20240
Total117