*Excludes Observations that spanned multiple years

Pre 19705
19700
19711
19720
19731
19740
19751
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19873
198830
198949
19905
199136
199241
1993322
1994203
1995154
199656
199756
199823
199945
200027
200143
200246
200338
200499
200551
200637
200737
200839
200931
201037
201147
201247
201340
201446
201540
201645
201739
201835
20199
202020
202142
202252
202335
20241
Total2015