*Excludes Observations that spanned multiple years

Pre 19707
19700
19712
19721
19730
19740
19750
19760
19770
19780
19791
19801
19811
19820
198316
19842
19850
198630
198716
198833
198920
199018
199116
1992108
199373
199450
1995119
199643
199747
199865
199925
20008
200136
200224
200338
2004124
2005169
200676
200755
200870
200952
201069
201179
201271
201366
201466
201576
201696
201773
20181
Total1943