*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
1972205
197392
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
198423
198516
198619
198785
1988141
1989148
1990105
1991145
199292
199397
199412
199511
199612
199711
19985
199947
200096
200163
200219
200346
200469
200579
200657
200764
200857
200955
201054
201182
201276
201389
201483
201584
201655
201771
20180
20190
Total2466