*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19930
19943
19950
19960
19971
19981
19990
20000
20010
20021
20033
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20143
20150
20160
20170
Total17