*Excludes Observations that spanned multiple years

Pre 19702
19702
19715
19721
19730
19740
19750
19760
19773
19780
19790
19801
19810
19821
19830
19842
198564
1986118
198793
1988405
198917
199071
1991206
1992105
1993168
1994102
1995162
1996123
1997174
199815
1999131
200011
20015
200216
200348
200424
200532
200624
200732
200843
200938
201020
201136
201233
201346
201433
201546
201637
201746
20183
20191
20203
20213
20223
20232
20241
Total2557