*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19901
19914
19920
19936
19946
19952
19963
19971
19980
19991
20000
20012
20020
20030
20040
20052
20066
20071
20080
20090
20100
20110
20121
20132
20140
20150
20160
20170
Total47