Hi Roger
The increase in Age Pension recipients was between 2008 (the ASFA numbers) and 2010 due to the increase in pension rates and the reduction in the taper rate (that were recently unwound). We used the 2010 data in the report to focus on the trend.
Also, the 70.6% of income units only measures those whose principal source was the age pension. There are many retirees who receive some age pension, but it is not their primary source of income. the latest data from the ABS (for 2015-16) reports 61.8% with the government pensions as their principal source of income, while 73.4% received some support (from DSS or DVA).