+1 I agree although 2% after year 4 might be too high. How about 1% after Year 4. Something like this:

Coins now: 171,000,000

• Year 1, Month 1-2 : 100% - 199,500,000 AC
• Year 1, Month 3-4 : 80%  -  226,100,000 AC
• Year 1, Month 5-6 : 60%  -  248,710,000 AC
• Year 1, Month 7-8 : 40%  -  265,290,666.6 AC
• Year 1, Month 8-10: 30%  - 278,555,200 AC
• Year 1, Month 10-12: 20% - 287,840,373.3 AC. This is end of Year 1
• Year 2, Month 1-2 : 15% -   295,036,382 AC
• Year 2, Month 3-4 : 10%  - 299,953,655 AC
• Year 2, Month 5-6 : 8%  -  303,953,037 AC
• Year 2, Month 7-8 : 6%  -  306,992,568 AC
• Year 2, Month 8-10: 4%  -  309,039,185 AC
• Year 2, Month 10-12: 3% - 310,584,381 AC. This is the end of Year 2
• Year 3: 2% - 316,796,068
• Year 4: 1%
• ...
• Year 10: 1%
• Year 100: 1%