SN4 ""

No	Pattern	Freq
1	[noun] over the past [num] years	382
2	[noun sg] over the past [adj] years	250
3	[noun pl] over the past [adj] years	141
4	[noun] over the past [det] years	77
5	[noun] over the past few years	77
6	[noun] over the past few years	77
7	[noun] over the past two years	53
8	[noun] over the past two years	53
9	[noun prp] over the past [adj] years	52
10	[noun] over the past five years	39
11	[noun] over the past five years	39
12	[noun] over the past 20 years	29
13	[noun] over the past 20 years	29
14	[noun] over the past three years	26
15	[noun] over the past three years	26
16	[noun] over the past 30 years	25
17	[noun] over the past 30 years	25
18	[noun] over the past ten years	22
19	[noun] over the past ten years	22
20	[noun] over the past 10 years	20
21	[noun] over the past 10 years	20
22	[n mass] over the past [adj] years	17
23	[noun] over the past four years	15
24	[noun] over the past four years	15
25	[noun] over the past 15 years	14
26	[noun] over the past 15 years	14
27	[noun] over the past twenty years	10
28	[noun] over the past six years	10
29	[noun] over the past six years	10
30	[noun] over the past twenty years	10