*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000302124
1970001001
1971000000
1972000011
1973000011
1974001001
1975000011
1976001023
1977000011
1978001023
1979000011
1980001012
1981000000
1982000022
1983001012
1984001012
1985000011
1986001034
1987013026
1988104016
19891160513
199011120317
199123150424
199225280641
199351150425
1994113720389
1995212350150
199617380147
199724160628
199802370140
199912100114
200031240230
200121180324
2002316570581
200321240330
200423660374
200516181329
2006319305102
200723810490
200815262337
200931110318
201022720379
2011018270348
201202580235
201300350136
201403100013
2015021003
20160161100162
2017001001
Total4330187531201342