*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
197211
19731
19740
19750
19760
19770
19780
19790
19801
19810
19820
19834
19840
19855
19862
198743
198891
198922
1990129
1991115
199288
199337
19942
19952
19961
19972
19981
199927
200011
200126
20022
20038
200433
200529
200629
20078
200818
20096
201058
201170
20129
201317
20149
20157
201613
20175
201823
Total966