The total amount of state guarantees in force under RSA 162-A:7-a, RSA 162-A:8, RSA 162-A:10, III, RSA 162-A:13, RSA 162-A:13-a, RSA 162-A:17, and RSA 162-I:9-b shall not exceed in the aggregate at any time $50,000,000 plus interest, provided that such amount shall be increased to $80,000,000 plus interest on January 1, 1993, to $95,000,000 plus interest on January 1, 1994, and to $115,000,000 plus interest on May 1, 2015, to $200,000,000 plus interest on June 1, 2023, and to $500,000,000 plus interest on March 1, 2026.