*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000103738
1970000011
1971000044
1972000022
1973000011
1974000000
1975000022
1976001023
1977000044
1978000044
1979002046
1980001045
1981000044
1982000033
198300101617
1984000066
1985000099
1986006017
19870040711
1988002024
19890030710
1990004026
199100140418
19920080210
19930050611
19940080715
19950080614
199600801018
1997001201325
1998005049
1999005038
200000801220
20010090716
200200120315
200300110112
200400401418
200500301215
20060080715
2007004048
2008001011021
20090060511
20100040610
201100311941
2012002013
2013003014
2014000000
2015000000
2016000011
2017000000
Total002132270485