*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19871
19881
19890
19900
19910
199213
19930
19943
19955
19960
19974
19980
19990
20000
20010
20021
20030
20040
20051
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20191
20201
20213
20225
20230
20240
Total40