*Excludes Observations that spanned multiple years

Pre 19704
19701
19710
19720
19730
19740
19751
19760
19773
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19955
19960
19970
19980
19990
20001
20010
20021
20032
20042
20054
20061
20070
20081
20091
20101
20110
20120
20130
20140
20150
20160
20170
Total29