*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197079004083
1970300205
1971600107
1972500106
1973600107
1974500308
1975800109
19768003011
197710003013
19789001010
197913001014
198011002013
198114000014
198216007023
198312002014
198418006024
198514002117
1986180015134
1987211017443
1988210021042
1989190028451
19901602122252
199120165819104
199216162757107
19932502113142282
19942304202557786
19952423180572781
19962003212538773
19973101208227467
1998280362385478
199924034679152
2000330091480604
2001350870329442
2002220270391485
2003252181395504
2004280258546634
20054302140160345
20063002165411608
20074670156409618
200837211258225542
2009391329379415
20105401470125650
201180007264810
20121592028914464
2013510144318513
201460020415225
201514010775106
2016120029142
2017000505
201810000010
Total126738664866621512452