<prompt> Andika mwendelezo kwa aya hii - Constantin pia alishinda medali nane katika ICF Canoe Sprint World Championships na fedha K-2 500 m: 1977 na shaba saba K-2 500 m: 1978  <response>: 1979, 1981; K-4 500 m: 1974, 1978, 1979, 1983. 