*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19861
19872
19886
19890
19900
19911
19920
19931
19945
19950
19961
19970
19980
19991
20001
20010
20022
20030
20041
20050
20060
20070
20088
20090
20100
20110
20121
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total34