*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19773
19781
19791
19802
19811
19820
19830
19842
19852
19861
19871
198857
19893
19903
199179
199294
199392
1994138
1995157
1996103
199765
199841
19990
20004
20015
200218
200313
200441
200556
200643
200729
200817
200920
201063
20117
20128
201317
201421
201517
201649
201755
201846
201955
202038
202139
202246
20232
20240
Total1558