*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19833
19840
19850
19861
19870
19887
19890
199010
19910
19922
19933
19942
19952
19960
199711
19982
199910
200038
200120
20026
200312
200410
200510
200612
20079
200815
20098
201016
201118
201227
201320
201429
201525
201627
201730
20180
Total387