*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197054005059
1970100102
1971500106
1972500106
1973700108
1974000000
1975200002
1976300003
197711001012
1978200002
1979600006
1980600107
1981600006
1982600107
1983300216
198414000014
1985700108
19869004013
19879002213
19885004211
198911002114
1990610119
19912118214
199270013828
19937003818
1994150045978
199571072843
199670034353
199770081631
199871044456
19996002412
2000130051634
2001110051430
2002900153862
200340061323
2004100077592
2005100171937
2006100073552
200780052841
2008900121839
20096009116
2010400213358
201171025942
20121600142151
2013000231235
2014000131427
2015400318
2016000000
2017000101
2018000000
Total364522585661195