*Excludes Observations that spanned multiple years

Pre 197011
19701
19713
19720
19730
19740
19751
19760
19771
19780
19790
19800
19810
19820
19830
19840
198514
19868
198743
198898
198919
199027
199142
199239
199353
199423
199562
199631
199720
199810
199952
200044
200112
200213
20031
200410
20056
200612
200713
200811
200916
20109
201112
20127
201312
20147
20156
201613
201721
20182
20190
20201
20211
20220
Total787