Injury, illness, and fatality information can be found on the U.S. Department of Labor, Bureau of Labor Statistics web site. Data has a two year lag time. 2005 is current data. 2007 data will be available in 2009.

Google: BLS SURVEY OF OCCUPATIONAL INJURIES, ILLNESSES, AND FATALITIES HOME PAGE

Click on: Fatal injuries - 2005 preliminary data now available. Under the heading Census of Fatal Occupational Injuries (preliminary data) select the desired search category.

(also)

Click on: NEW Case and demographic characteristics. Select desired category from: Resource Table Categories - Calendar Year 2005 Survey Results. Select any desired sub-category for data review.

There is statistical information available on various material moving/industrial truck subjects. It has to be mined, however, and obtained bit by bit.
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Those interested in useful information for training purposes would be better served using the information that can be found in the NIOSH FACE program.

Google: NIOSH FATALITY ASSESSMENT AND CONTROL EVALUATION FACE PROGRAM

Under Cause, click on: Machine Related and scroll through the (Manufacturing, Farming, Construction, or General) sections of the NIOSH FACE data or the participating State FACE data looking for the words forklift or other key words such as skid steer, etc., in the synopsis. Click on any report number for a detailed report.

An actual incident has more meaning than a simple statistic.

You can subscribe to a free NIOSH automatic e-mail announcement service for new FACE reports as they become available by submitting your e-mail address at the bottom of the FACE home page.
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OSHA does not collect statistical data on the effect of training in the reduction of accidents. It's premise is that a reduction in accidents should come as a result of proper training.

NIOSH contracted one dubious study pertaining to training effectiveness in 1984 which OSHA used in 1996 during its proposed rulemaking for OSHA CFR 1910.178.

Google: OSHA SECTION 4 - IV STUDIES OF ACCIDENT AND INJURY DATA AND TRAINING for the report synopsis (B. Studies Measuring the Effectiveness of Powered Industrial Truck Safety Training Programs).