*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19903
19915
19923
19930
19944
19951
19965
19970
19984
19996
20001
20011
20020
20030
20041
20057
20060
20076
20083
200916
201013
201121
201221
201319
20148
201510
20165
20170
20180
20190
20200
20210
20220
Total164