Table 9. Payments into Medicare Trust Funds and Percent Distribution, by Type of Fund and Source of Income: Selected Calendar Years 1967-93.

Year and Source of Income	Total		Hospital Insurance Trust Fund		Supplementary Medical Insurance Trust Fund
	Amount in Billions	Percent Distribution	Amount in Billions	Percent Distribution	Amount in Billions	Percent Distribution
1967
Total	$5.2	100.0	$3.6	100.0	$1.6	100.0
Payroll Taxes	3.2	62.0	3.2	89.8	—	—
General Revenues	1.2	24.1	0.3	8.8	0.9	58.4
Premiums	0.6	12.4	—	—	0.6	40.1
Interest	0.1	1.5	0.1	1.4	0.0	1.5
1972
Total	$9.2	100.0	$6.4	100.0	$2.8	100.0
Payroll Taxes	5.8	62.9	5.8	90.5	—	—
General Revenues	1.8	19.7	0.4	6.7	1.4	49.5
Premiums	1.4	15.0	—	—	1.4	49.2
Interest	0.2	2.4	0.2	2.8	0.0	1.3
1983
Total	$64.4	100.0	$44.6	100.0	$19.8	100.0
Payroll Taxes	37.6	58.4	37.6	84.4	—	—
General Revenues	19.2	29.8	14.3	9.7	14.9	75.0
Premiums	4.3	6.6	0.0	0.1	4.2	21.4
Interest	3.3	5.2	2.6	5.8	0.7	3.7
1993
Total	$155.9	100.0	$98.2	100.0	$57.7	100.0
Payroll Taxes	84.5	54.2	84.5	86.1	—	—
General Revenues	41.9	26.9	0.4	0.5	41.5	71.9
Premiums	14.9	9.5	0.7	0.7	14.2	24.6
Interest	14.6	9.3	212.5	12.8	2.0	3.5

¹Includes a $3.5 billion lump-sum general revenue transfer for non-contributory military wage credits.

²Includes a $1.8 billion transfer from the supplementary medical insurance catastrophic coverage reserve fund.

NOTES: 0.0 denotes less than $50 million. Numbers and percents may not add to totals because of rounding.

SOURCE: Health Care Financing Administration, Office of the Actuary: Data from the Office of National Health Statistics.