*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19880
19891
19900
19916
19921
199312
19941
19950
19960
19973
19980
19991
20000
20011
20021
20036
20042
20052
20068
20077
20084
20096
20105
201126
201240
201328
201429
201539
201635
201723
20180
Total289