*Excludes Observations that spanned multiple years

Pre 197012
19701
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19817
19820
19830
19840
19850
19860
198715
19880
19891
19901
19914
19922
19932
199412
19959
199616
199715
199810
19999
200020
200129
200216
200313
20042
20052
20062
20072
20086
200948
20106
201110
20123
20132
20143
20154
20162
20174
Total292