I can't find any really reliable source for average match, so I don't know. Just know that 6 of the 7 companies matched dollar for dollar up to 3% of your salary. The 7th matched 50 cents on the dollar, the employer match capped at 3%, but you had to put in 6% to get that.
My wife's 2 employers were dollar for dollar to 3%. Her current employer however limits your contributions to 8% of your pay. Actually, they say the IRS limits it to 8% because they have a pension plan, but the 8% cap even applies to employees who are not covered by the pension plan.