*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000106465
1970000011
1971000033
1972000022
1973000066
1974000000
1975000099
1976001078
197700101213
1978000066
1979000022
198000101213
198100101516
1982002079
1983000044
198400001515
198500202022
198600201921
198700101516
1988000077
198900202224
199000211417
1991001622139
1992001201830
199300711826
19940031711
199500201416
19960021811
199700201214
199800901019
1999001202032
200000501823
2001001213750
2002001811736
2003001501530
200400602733
200500401418
200600302124
2007001512440
2008001001525
20090070916
2010001157
2011003901352
2012002523865
201300471452
2014000000
2015001012
2016000011
2017000000
Total0028913649951