*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19886
19892
19903
19912
19920
19931
19940
19958
199616
19970
19980
19990
20000
20011
20027
200327
200430
200530
200628
200727
200821
200920
201020
201118
201210
201317
201411
201511
20165
20176
20185
20193
20205
20213
20224
20230
20240
Total348