*Excludes Observations that spanned multiple years

Pre 19700
19700
19716
19720
19730
19740
19750
19760
19771
19783
19790
19800
19810
19820
19830
19841
198544
198633
198766
1988143
198913
199035
1991139
199287
1993142
199420
1995218
1996138
1997194
199811
199922
200049
200172
200238
200332
200441
200528
20066
200716
200837
200916
201027
201113
201216
201319
20146
201510
20168
201712
20186
20198
20209
20212
20223
20230
20240
Total1790