Plot a suitable time series method and comment on the underlying pattern in the proportion of singles among residents aged 20 to 29 over 2011-2020 with the data set given below:

YEARS	RESIDENTS AGED 20-29 YEARS
	MALES			FEMALES			GRAND TOTAL
	SINGLE	OTHERS	SUB-TOTAL	SINGLE	OTHERS	SUB-TOTAL
2011	220,200	28,800	249,000	189,100	60,300	249,400	498,400
2012	232,400	23,900	256,300	192,800	55,000	247,800	504,100
2013	224,300	24,100	248,400	191,100	52,100	243,200	491,600
2014	232,700	22,900	255,600	203,800	46,100	249,900	505,500
2015	226,700	25,300	252,000	197,500	51,600	249,100	501,100
2016	236,100	30,300	266,400	205,200	54,200	259,400	525,800
2017	227,300	28,700	256,000	193,200	51,400	244,600	500,600
2018	230,000	28,000	258,000	201,200	50,400	251,600	509,600
2019	235,100	28,900	264,000	198,000	47,500	245,500	509,500
2020	237,600	28,100	265,700	212,400	49,800	262,200	527,900