*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
1972165
197350
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
198431
19850
198634
198791
1988126
198963
199069
199172
199233
199328
19941
19950
19960
19973
19980
199954
200063
200142
200219
20036
20042
20052
20068
20077
20084
20096
20105
201126
201240
201328
201429
201539
201635
201723
20180
20190
Total1206