*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19865
19871
19880
19890
19903
199111
19928
19935
199410
199530
19967
199717
19981
199941
20000
20010
20021
20032
20040
20054
20061
20071
20081
20090
201048
201132
20129
20136
20145
20150
20161
20170
Total250