*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970400206
1970000000
1971000000
1972000000
1973100001
1974000000
1975100001
1976100001
1977100001
1978000101
1979100001
1980000000
1981000000
1982000000
1983000101
1984000000
1985000112
1986000101
1987000303
1988000224
1989001405
1990000505
199110011012
19920017210
19930026311
19940017513
19950007613
1996000426
19970048315
19981029315
19992016312
200010212318
20011034311
200200110314
2003104131028
20041038618
20051015613
200600210315
200700112518
200800011213
2009000415
2010003322560
201110920232
201210576064
20130027110
20140038011
20150037111
2016001012
2017000101
2018000000
Total200107255102484