*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19753
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19882
19892
19900
19911
19929
199314
19943
19951
19963
19970
19984
19991
20002
20010
20020
20030
20040
20050
20061
20070
20081
20092
20100
20111
20120
20130
201410
20155
20166
20171
20181
20190
20200
20210
20220
Total74