*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19951
19961
19970
19980
19991
20001
20011
20021
20030
20041
20050
20060
20070
20080
20090
20100
201147
20122
20130
2014261
20150
20162
20170
20180
20191
20200
20211
20222
20230
20240
Total326