*Excludes Observations that spanned multiple years

Pre 19706
19701
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19861
19870
19880
19890
19900
19911
19920
19930
19940
19950
19960
19970
19981
19991
20000
20011
20021
20031
20040
20055
20062
20072
20081
200945
20101
20110
20123
20132
201410
20156
201611
20171
20180
Total105