*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
198713
19880
19890
19906
19911
19920
19930
19940
19950
19961
19970
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20101
20113
20120
20130
20140
20150
20160
20170
20180
20190
20201
20211
20220
20231
20240
Total30