*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19741
19750
19760
19770
19780
19791
19808
19812
19821
19831
19842
19852
19862
19871
19882
19893
19903
19911
19922
19932
19945
19954
19963
19979
199820
199925
200023
200112
20029
200311
200423
200512
20069
20078
200825
200944
201039
201140
201268
201335
201425
201520
20162
20177
Total518