Database schema:

CREATE TABLE divisions (
	division TEXT NOT NULL -- example: ['D1', 'B1'],
	name TEXT -- example: ['Division 1A', 'Bundesliga'],
	country TEXT -- example: ['Deutschland', 'Belgium'],
	PRIMARY KEY (division)
)


CREATE TABLE matchs (
	"Div" TEXT -- example: ['D1', 'B1'],
	"Date" DATE -- example: ['2020-08-08', '2020-08-09'],
	"HomeTeam" TEXT -- example: ['Antwerp', 'Club Brugge'],
	"AwayTeam" TEXT -- example: ['Mouscron', 'Charleroi'],
	"FTHG" INTEGER -- example: ['0', '1'],
	"FTAG" INTEGER -- example: ['0', '1'],
	"FTR" TEXT -- example: ['A', 'D'],
	season INTEGER -- example: ['2020', '2021'],
	CONSTRAINT fk_matchs_divisions FOREIGN KEY("Div") REFERENCES divisions (division)
)

Question: What is the percentage whereby the away team scored 2 goals during the 2017 seasons?
Evidence: scored 2 goals refers to FTAG = 2, which is short name for Final-time Away-team Goals; DIVIDE(COUNT(Div where season = 2017, FTAG = '2'), COUNT(Div where season = 2017)) as percentage;

SQL:
SELECT CAST(SUM(CASE WHEN FTAG = 2 THEN 1 ELSE 0 END) / COUNT(FTAG) AS REAL) * 100 FROM matchs WHERE season = 2017