*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
19901
19912
19921
19930
19943
19951
19960
19970
19981
19990
20001
20010
20020
20030
20040
20050
20060
20070
20081
20091
20100
20110
20120
20130
20140
20150
20161
20170
20180
20191
20201
20212
20221
20230
20240
Total18