*Excludes Observations that spanned multiple years

Pre 19703
19701
19712
19722
19731
197414
19754
19764
19770
19781
19791
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total38