SN4 ""

No	Pattern	Freq
1	past [num] years	2203
2	past [det] years	432
3	past few years	430
4	past few years	430
5	past two years	328
6	past two years	328
7	past five years	205
8	past five years	205
9	past three years	181
10	past three years	181
11	past ten years	144
12	past ten years	144
13	past 10 years	135
14	past 10 years	135
15	past 20 years	119
16	past 20 years	119
17	past four years	106
18	past four years	106
19	past 30 years	82
20	past 30 years	82
21	past 12 years	76
22	past 12 years	76
23	past 15 years	60
24	past 15 years	60
25	past six years	59
26	past six years	59
27	past twenty years	54
28	past twenty years	54
29	past 40 years	49
30	past 40 years	49