*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000006262
1970000033
1971000077
1972000033
1973000055
1974001067
1975000077
1976000066
197700001010
1978000066
1979000088
1980001089
198100001212
198200001010
1983000066
1984000044
1985000033
198600101112
19870050914
19880020911
1989022101235
1990011001122
19910060612
19921130914
199301551013169
199402795010294
199502413015259
199613524011368
199705257014546
199822528010272
199902053011219
200002393015257
200101963010209
20020207506218
20030241408253
200403194010333
200502627012281
2006131124010346
200702649113287
2008025150646
200911320438
201003550361
201100440145
201200111820
201300120113
201404101015
201500120012
2016005005
2017000000
Total6409532634244854