*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
197221
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19831
198447
198529
198665
198775
198892
198954
199057
199133
199240
199329
19947
199518
199610
199712
199813
199922
200043
200114
200216
200331
200424
200550
200647
200732
200844
200942
201042
201143
201242
201350
201444
201548
201640
201738
20180
20190
Total1317