Exhibit 12

Computation of Ratio of Earnings to Fixed Charges



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|------------------------------------------------------------------ |  | --------------------- | ------ | - | ---- | - | ------ | ---- |  | - | ------ | - |  | ---- | ------ | - |  | - | ------
|                                                                   |  | Years Ended March 31,
|                                                                   |  | 2006                  |        |   | 2005 |   |        | 2004 |  |   | 2003   |   |  | 2002
|                                                                   |  | (in thousands)       
|Earnings                                                           |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Consolidated pretax income (loss) from continuing operations       |  | $                     | 12,465 |   |      | $ | 5,439  |      |  | $ | (9,124 | ) |  | $    | 15,789 |   |  | $ | 7,460 
|Equity in earnings (losses) of investees                           |  |                       | (1,027 | ) |      |   | (538   | )    |  |   | (742   | ) |  |      | (152   | ) |  |   | 904   
|Distributed income of equity investees                             |  |                       | 818    |   |      |   | 847    |      |  |   | 786    |   |  |      | 1,286  |   |  |   | 405   
|Interest                                                           |  |                       | 11,375 |   |      |   | 9,535  |      |  |   | 8,826  |   |  |      | 11,307 |   |  |   | 11,934
|Net amortization of debt discount and premium and issuance expense |  |                       | 470    |   |      |   | 488    |      |  |   | 541    |   |  |      | 612    |   |  |   | 628   
|Interest portion of rental expense                                 |  |                       | 1,693  |   |      |   | 1,438  |      |  |   | 1,392  |   |  |      | 1,424  |   |  |   | 1,440 
|                                                                   |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Total earnings                                                     |  |                       | 25,797 |   |      |   | 17,209 |      |  |   | 1,679  |   |  |      | 30,266 |   |  |   | 22,771
|                                                                   |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|                                                                   |  |                       |        |   |     
|Fixed Charges                                                      |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Interest                                                           |  |                       | 11,375 |   |      |   | 9,535  |      |  |   | 8,826  |   |  |      | 11,307 |   |  |   | 11,934
|Net amortization of debt discount and premium and issuance expense |  |                       | 470    |   |      |   | 488    |      |  |   | 541    |   |  |      | 612    |   |  |   | 628   
|Interest portion of rental expense                                 |  |                       | 1,693  |   |      |   | 1,438  |      |  |   | 1,392  |   |  |      | 1,424  |   |  |   | 1,440 
|                                                                   |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|Total fixed charges                                                |  |                       | 13,541 |   |      |   | 11,461 |      |  |   | 10,759 |   |  |      | 13,343 |   |  |   | 14,002
|                                                                   |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       
|                                                                   |  |                       |        |   |     
|Ratio of earnings to fixed charges                                 |  |                       | 1.9x   |   |      |   | 1.5x   |      |  |   | 0.2x   |   |  |      | 2.3x   |   |  |   | 1.6x  
|                                                                   |  |                       |        |   |      |   |        |      |  |   |        |   |  |      |        |   |  |   |       

For purposes of calculating earnings to fixed charges, earnings consist of net income plus fixed
charges. Fixed charges consist of interest expense, amortization of debt issue cost and discount or premium relating to indebtedness and the portion (30%) of rental expense on operating leases which NWS estimates to be representative of the
interest factor attributable to rental expense.