Consider the following statements:
1. The Nation celebrates 24th April of every year as National Panchayati Raj Dayto mark the passing of the 73rd Constitutional Amendment Act, which came into force on this day in 1993.
2. The Government of India celebrates April 21 every year as 'Civil Services Day'in honor of Sardar Vallabhbhai Patel's address to the probationers of Administrative Services Officers on this date in 1947.
3. The National Science Day is celebrated on January 30th to commemorate the discovery of the Raman Effect by Indian physicist Sir C.V. Raman.
4. The National Maritime Day is observed on April 5th to honor the maritime history of India and the contribution of the shipping industry.
How many of the statements given above are correct?