The year-on-year rate of Company-wide sales growth was 7%, driven by results in the Business Technologies Business, which achieved a 10% rate of growth. Of the two components under the Business Technologies Business, the office services field and the commercial and industrial printing field, net sales generated by the commercial and industrial printing field in particular achieved positive results with 23% growth. While this figure encompasses results of new mergers and acquisitions, organic growth alone amounted to 18%.
Operating income increased by 14% year on year. While that increase is partially attributable to favorable results in the Business Technologies Business, it is also due to the positive effect of withdrawal from business involving glass substrates for HDDs in the Industrial Business, as well as the Company's shift from the low-profit, low-earnings business of components for digital home electronics over to profitable operations involving products for industrial and professional use. Sales and profits rose with respect to performance materials, centered on TAC films. Trends for the full year do not significantly vary from 4Q results.
Operating income increased by 14% year on year. While that increase is partially attributable to favorable results in the Business Technologies Business, it is also due to the positive effect of withdrawal from business involving glass substrates for HDDs in the Industrial Business, as well as the Company's shift from the low-profit, low-earnings business of components for digital home electronics over to profitable operations involving products for industrial and professional use. Sales and profits rose with respect to performance materials, centered on TAC films. Trends for the full year do not significantly vary from 4Q results.