SN4 ""

No	Pattern	Freq
1	[noun sg] over the past [num] years	206
2	[noun pl] over the past [num] years	114
3	[noun] over the past two years	53
4	[noun prp] over the past [num] years	45
5	[noun] over the past five years	39
6	[noun] over the past 20 years	29
7	[noun] over the past three years	26
8	[noun] over the past 30 years	25
9	[noun] over the past ten years	22
10	[noun] over the past 10 years	20
11	[n mass] over the past [num] years	17
12	[noun] over the past four years	15
13	[noun] over the past 15 years	14
14	[noun] over the past twenty years	10
15	[noun] over the past six years	10
16	[noun] over the past 12 years	9
17	[noun] over the past 40 years	9
18	[noun] over the past 50 years	8
19	[noun] over the past hundred years	8
20	[noun] over the past thirty years	6
21	country over the past [num] years	6
22	britain over the past [num] years	6
23	britain over the past [num] years	6
24	[noun] over the past 14 years	5
25	[noun] over the past 25 years	5
26	[noun] over the past fifty years	5
27	country over the past [num] years	5
28	[noun] over the past 200 years	5
29	[noun] over the past nine years	5
30	change over the past [num] years	5