*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19811
19820
19830
19840
19850
19860
19871
198829
19892
19900
19912
19924
19936
19949
199510
19968
19977
199816
19994
20003
20018
20021
20038
200411
20051
20061
20072
20082
20095
20101
20115
20129
201313
20147
20151
20168
20170
20189
20190
20201
20210
20224
20231
20241
Total203