According to this passage, what percent of the lithography machine market do Ultratech, Canon and Nikon, MKS Instruments, Lam Research and Cadence Design Systems have in aggregate?

Context: ASML produces the photolithography machines used in the production of computer chips. In these machines, patterns are optically imaged onto a silicon wafer that is covered with a film of light-sensitive material. This procedure is repeated dozens of times on a single wafer. The photoresist is then further processed to create the actual electronic circuits on the silicon. The optical imaging that ASML's machines deal with is used in the fabrication of nearly all integrated circuits and, as of 2011, ASML had 67 percent of the worldwide sales of lithography machines.

ASML's competition consisted of Ultratech, Canon and Nikon, MKS Instruments, Lam Research and Cadence Design Systems.

Answer: If ASML has 67 percent of the worldwide sales of lithography machines and if Ultratech, Canon and Nikon, MKS Instruments, Lam Research and Cadence Design Systems represent their sole competition, than these companies must share the remaining 33 percent of the market.