*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972005005
1973000000
1974000000
1975000000
1976000000
1977007007
1978001001
1979004004
1980007007
1981003003
1982003003
1983000000
1984004004
198502100012
198612130016
198711100012
1988005005
19890740011
19900680014
1991110230034
199231240028
1993411350252
1994421640291
19954108501100
199639650077
199741011203129
19982198600107
199984300345
20003158701106
2001649903112
20020210200104
20038311803132
20042911101123
20053211500120
200621114301157
20076810102117
200851410500124
20095319500203
20106924100256
201141527500294
20124514801158
20134712800139
2014121440066
201546280038
201603270030
2017015006
Total9825126810233053