Exemption for mutual funds

If I invest Rs.10,000 in Tax Exempted MF in Year 1, I will get an exemption of Rs.10,000 u/s 80C. Now if I again invest Rs.10,000 in Year 2, what is the amount of exemption that I can claim in year 2? Is it Rs. 20,000 (Year 1+Year 2) or only Rs. 10,000 invested in Year 2.