*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19741
19752
19762
19771
19781
19793
19800
19813
19820
19833
19842
19853
19861
19871
19880
19891
19900
19916
19922
19931
19940
19951
19960
19970
19980
19990
20000
20010
20021
20033
20041
20050
20061
20071
20080
20090
20100
20110
20120
20131
20140
20150
20160
20170
20180
Total48