*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19920
19930
19949
19952
19960
19970
19987
19990
20006
20010
20020
20030
20040
20050
20060
20070
20080
20091
20101
20110
20120
20130
20141
20150
20162
20170
20180
20193
20201
20211
20221
20232
20241
Total40