Model tweaks

Hi guys, thanks for developing this nice model. Here are some tweaks. 
Nice chatting with you Jarod :)
The current rate is the best estimate for future rates. Historical rates shouldn't be used as "historical performance is no indication of future performance". The indexation is also capped at 6% so the slider should have that as a maximum. See 2nd paragraph:

http://budget.gov.au/2014-15/content/bp2/html/bp2_expense-09.htm