*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19877
198812
19890
19901
19911
19920
19930
19941
19950
19960
19970
19980
19990
20008
20010
20020
20031
20041
20050
20060
20070
20081
20095
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total40