1981 Honda ATC250R
1983 Honda ATC200X / Honda ATC250R[Redesign]
1984 Kawasaki KXT250 Tecate
1985 Honda ATC250R[Redesign] / Honda ATC350X/Suzuki LT230SQuadSport/ Suzuki LT250R QuadRacer/Yamaha YTZ250 Tri-Z
1986 Honda ATC200X[Redesign] / Honda TRX250R / Kawasaki KXT250 Tecate[Redesign]
1987 Honda TRX250X / Kawasaki KSF250 Mojave / Kawasaki KXF250 Tecate-4 / Polaris 250 Cyclone/ Suzuki LT500R QuadRacer
Yamaha YFM350X Warrior / Yamaha YFZ350 Banshee
1988 Yamaha YFS200 Blaster
1989 Suzuki LT250S QuadSport
1991 Honda TRX250X[Re-Intro]
1993 Honda TRX300EX
1994 Polaris Sport 400L
1995 Kawasaki KEF300 Lakota
1999 Honda TRX400EX
2000 Bombardier DS650 / Polaris Scrambler2WD 400
2001 Cannondale FX400 / Honda TRX250EX / Polaris Scrambler2WD 500 / Yamaha YFM660R Raptor
2002 Bombardier DS650 Baja / Cannondale Moto440 / Cannondale Blaze440 / Cannondale Speed440 / Cannondale Cannibal440
2003 ArcticCat DVX400 / Cannondale Glamis440 / GasGas WildHP 300 / GasGas WildHP 450 / Kawasaki KFX400
Polaris Predator 500 / Suzuki LTZ250 QuadSport / Suzuki LTZ400 QuadSport
2004 Bombardier DS650 Baja-X / Honda TRX450R / Kawasaki KFX700 V-Force / Yamaha YFM350X Raptor / Yamaha YFZ450


You have 12 total different Honda models, 6 trikes and 6 quads, over a 24 year span......3 intoduced in the last 10 years.

You have 7 total different Yamaha models, 1 trike and 6 quads, over a 21 year span........3 introduced in the last 10 years.

You have 6 total different Suzuki models, all quads, over a 21 year span...........................2 introduced in the last 10 years.

You have 6 total different Kawasaki models, 2 trikes and 4 quads, over a 22 year span....3 introduced in the last 10 years.

There were no new sport ATVs introduced in 1982,1990,1992,1996,1997, and 1998.

 

Thanks for the info