*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
197222
19732
19740
19750
19760
19770
19781
19792
19800
19810
19820
19831
198416
19856
198629
198766
1988116
198976
199043
199192
199235
199325
199413
199514
199629
199734
19985
1999142
200095
200147
20028
200329
200426
200532
200627
200729
200835
200925
201046
201136
201229
201334
201436
201542
201638
201740
20181
Total1428