*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19863
19870
19880
19890
19905
19911
19921
19930
19940
19950
19960
19971
19980
19994
20007
20010
20021
20030
20041
20050
20060
20071
20083
20090
201015
201115
20123
20132
20142
20154
20161
20173
20180
Total74