Summarise the main features of Table 1 below and comment on differences between and within countries over time.

Table 1 Population projections by age group (19802100)

	1980	2020	2060	2100
Japan
All (000s)	117,817	126,476	98,326	74,959
014y	24%	12%	11%	12%
1564y	68%	59%	50%	51%
65y+	9%	28%	38%	37%
Tanzania
All (000s)	18,538	59,734	158,869	285,652
014y	46%	44%	33%	25%
1564y	51%	54%	61%	63%
65y+	3%	3%	6%	12%
UK
All (000s)	56,209	67,886	75,060	78,053
014y	21%	18%	15%	15%
1564y	64%	64%	58%	56%
65y+	15%	19%	27%	30%

Note: The distribution of population by age group is in percentages (and they may not sum to 100% because of rounding). The total population figures are absolute numbers, in thousands (000s).

(Adapted from United Nations, 2019).