*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19905
19912
19920
19931
19944
19955
19962
19971
19983
19991
20000
20010
20020
20034
20040
20052
20061
20070
20081
20091
20101
20110
20122
20130
20140
20150
20160
20170
Total44