*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19701040042110
1970400004
197110000010
1972700007
1973700007
1974500005
1975800008
197612001013
197713001014
197811000011
197919002021
198013005018
198116003019
198216001017
198317002019
198417000017
198516001017
198614003017
198722007029
198823004027
198916002018
199022304029
1991220015037
199219006025
1993290012041
199423108032
199525107033
199617004021
199726007033
1998231011035
199914007021
200034109044
200132109042
2002150020035
2003200014034
2004250013038
200533006039
2006250010035
2007331012046
2008234018045
2009190022041
2010130011024
2011201046067
2012351021057
201351010016
20142107010
2015000202
2016050106
2017020002
2018000000
Total92424034821298