*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19911
19921
19930
19941
19950
19960
19970
19980
19990
20000
20010
20020
20031
20042
20054
20060
20072
20081
20093
201011
20116
201223
20132
20140
20150
20160
20170
Total60