*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19896
19909
199123
199225
199339
199425
199546
19967
199726
199830
199925
200023
20018
200213
200340
200456
200581
200652
200756
200848
200958
201048
201178
2012109
201392
201483
2015113
201683
201776
20181
Total1381