*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010100011
1970002002
1971000000
1972000000
1973000000
1974010001
1975020002
1976000000
1977002002
1978000000
19790850013
198021330018
1981001001
1982003003
1983001001
1984000000
1985001001
1986012003
1987000000
1988123006
19890590014
199031050018
19915480017
1992043007
19931460011
199402180029
19955189900203
199643440042
19971312700320
19982105600113
1999461200085
20003831600102
20014269600279
200202602300283
2003203432100384
200494353200476
200542462500275
2006133051900337
2007175934100651
200873443800389
200971723900218
201086834300734
201127116000773
201287936000861
201311321500148
2014049380087
2015010240034
2016006006
2017000000
Total1326204624006960