*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
19883
19890
19900
19911
19920
19930
19940
19950
19960
19970
19980
19990
20009
20010
20020
20032
20040
20050
20060
20071
20080
20090
20100
20110
20122
20130
20140
20150
20160
20170
20181
20191
20200
20210
20220
20230
20240
Total20