*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972000000
1973002002
1974000000
1975003003
1976001001
1977002002
1978001001
1979001001
1980012003
1981002002
1982002002
1983000000
1984001001
1985011002
1986001001
198704120016
198800190019
198903220025
199021540021
199131260021
19921252500258
199315351200548
19942148231001515
19950117819001197
1996013588001366
199718551300869
1998111226001129
199902131500228
20001117220001193
200105491700566
200239342500962
200307542800782
20040121821001239
200504412300464
200605205100571
200708465800904
200804415900500
20091527100124
2010031216000472
2011021512000335
201222841400300
2013233915000491
2014025311600369
201505200025
201601690025
2017000000
Total201538211550016557