Given the task definition and input, reply with output. This task involves annotating the answer type to a given question that involve some kind of complex reasoning (including numerical reasoning). Note that the questions require looking at more than one part of the passage to answer. There are 3 possible answer types (i) spans, (ii) numbers and (iii) dates. If the answer can be found in the passage, label it as "span". If the answer is a number, label as "number". Similarly, label "date" if you think the answer to the given question is a date.

Passage: On 14 August the British entered the city. They had obtained possession of the most important harbour in the Spanish West Indies along with military equipment, 1,828,116 Spanish pesos and merchandise valued around 1,000,000 Spanish pesos. Furthermore, they had seized 20% of the ships of the line of the Spanish Navy, namely Aquilon , Conquistador , Reina , San Antonio , Tigre , San Jenaro , Africa , America , Infante and Soberano , together with 3 frigates, 9 smaller vessels including the Marte commanded by Domingo de Bonechea and some armed vessels belonging to trading companies . Furthermore, two new almost-completed ships of the line were seized in the dockyards - San Carlos and Santiago .
Question: How many ships in percent did the British not seize?
number