*Excludes Observations that spanned multiple years

Pre 19701
19702
19710
19720
19730
19740
19750
19761
19770
19780
19790
19800
19811
19820
19831
19840
19850
198626
19872
198810
1989342
19909
19912
19925
1993276
199471
199538
1996102
199740
199815
19995
200019
20011
20026
200382
200479
200598
200669
200793
200873
200973
201091
201178
201287
201385
201481
201580
201671
201785
20184
Total2204