*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
1972117
197347
19740
19750
19760
19770
19781
19791
19802
19812
19821
198315
198469
198575
1986102
1987247
1988414
1989172
1990361
1991604
1992381
1993221
199435
1995100
19965
199753
199850
1999159
2000168
2001142
200246
200314
200483
200592
200628
200730
200843
200922
201084
201196
201229
201330
201426
201532
201650
201762
20185
Total4320