Year Ended December 31,

2010

2009

2008

2007

2006

Fixed Charges:

Interest expense

$

8,467,651

$

7,118,461

$

4,787,748

$

2,799,194

$

1,555,671

Imputed interest on the rental expenses

$

44,325

$

54,301

$

210,437

$

130,516

$

36,298

Amortized premiums, discounts and capitalized expenses related to indebtedness

—

—

—

—

—

An estimate of the interest within rental expense

—

—

—

—

—

Preference security dividend requirements of consolidated subsidiaries

—

—

—

—

—

Total fixed charges

$

8,511,976

$

7,172,762

$

4,998,185

$

2,929,710

$

1,591,969

Preference Security Dividend:

—

—

—

—

—

Earnings:

pre-tax income

$

62,513,493

$

49,409,448

$

33,845,605

$

19,956,860

$

4,692,414

fixed charges

$

8,511,976

$

7,172,762

$

4,998,185

$

2,929,710

$

1,591,969

Amortization of capitalized interest

—

—

—

—

—

distributed income of equity investees

—

—

—

—

—

share of pre-tax losses of equity investees

—

—

—

—

—

Less:

interest capitalized

1,096,176

23,375

—

—

—

preference security dividend requirements of consolidated subsidiaries

—

—

—

—

—

the non-controlling interest in pre-tax income of subsidiaries that have not incurred fixed charges

—

—

—

—

$

15,047

Total earnings

$

69,929,293

$

56,558,835

$

38,843,790

$

22,886,570

$

6,269,336

Ratios

Earnings to fixed charges

8.22

7.89

7.77

7.81

3.94

Sum of fixed charges and preference dividends to earning

0.12

0.13

0.13

0.13

0.25

Pro forma ratios (excluding interest expenses)

Earnings to fixed charges

N/A

N/A

N/A

N/A

N/A

Sum of fixed charges and preference dividends to earnings

—

—

—

—

—