*Excludes Observations that spanned multiple years

Pre 19700
19700
19713
19720
19730
19740
19750
19760
19773
19780
19791
19800
19810
19820
19830
19840
198512
198635
198750
1988161
198919
199013
199168
199228
199346
199410
1995154
199699
199785
19985
199976
200037
200134
200216
200339
200419
200520
200620
200720
200831
200927
201021
201121
201223
201331
201426
201536
201636
201720
201815
201933
202015
202136
20228
20238
20240
Total1460